Use the Time Tracker Mini audio and visual timer in the classroom or home for timed activities.It’s easy to use – simply turn the green dial to the desired time from 5 minutes to 2 hours, set the yellow dial to the warning time and press Start.The timer dome light will turn green and begin to count down the time. If you set a warning time, the dome light will turn yellow, and a short tone will play.When the time has expired, the light dome turns red and an alarm sounds.Timer volume can be adjusted or muted if desired.Time Tracker Mini requires 3 AAA batteries, not included.